Pattren Develpmont Flashcards
Top takeoff end boot and garbage chute are examples of
Triangulated fittings
The hypotenuse is a side on what kind of triangle?
Right angle triangle
Pythagorean equation is ?
A2 + b2 = c2
A face line is used when a triangulating ______________fitting ?
A. Ships ventilators
B. Right angled
C. Transitional Y branch
D. Top takeoff
C. Transitional y branch
A foreshortened line is ?
A line that appears to
Be shorter than it really is
A true length triangles horizontal leg is ?
A foreshortened dimension
Rectangular transitions are used to retro fit _______ to existing plenum ?
New furnace
Can the vertical height of a fitting include seams and allowances ?
Yes
Does the face like run 90 degrees to the secondary y branch opening ?
No
When determining the vh for a pattern what must be subtracted ?
All seams and allowances
Is square to round is on center do u need half pattern or quarter pattern ?
Quarter
What are two ways to describe triangulation?
Finding the length of a hypotenuse useing the vertical and horizontal legs of a right triangle
Developing the surfaces of fittings with surfaces that slant at diffrent angles
What are lines on the square to round plan view called from b to numbers ?
Element lines
What are true length lines ?
May be longer than they appear
They are lines that are perpendicular to the viewers line of vision
What is a foreshortened line ?
Object, construction or element line that appears to be short than it Accutally is because it is slanting towards or aways from the viewer
What is a True length triangle
Right angle trainagle shoes horizontal leg is equal to the length of the foreshortened line (taken from plan view ) and its vertical leg is equal to the vertical height of the fitting
What is a face line ?
It’s a perpendicular line representing the branch opening for an elbow or y branch
When useing the vertical height for triangulation all seams and allowances must be subtracted prior to creating the right angle for determining true length triangles?
True or false ?
True
What is triangulation ?
Method used to develop patterns for irregular shapes and forms which cannot be developed useing parallel or radial line development
What is Pythagorean theorem ?
It is an equation that recognizes the realationship between the sides of a right angle triangle
A squared + b squared = c squared
What is the primary advantage of useing a transitional elbow ?
Combined two fittings into one so space materials and fabrication time are all saved
